<!DOCTYPE html>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="resources/webxr_util.js"></script>
<script src="resources/webxr_test_constants.js"></script>

<script>
let fakeDeviceInitParams = TRACKED_IMMERSIVE_DEVICE;

let testSessionEnded = function(session, fakeDeviceController, t) {
  return new Promise((resolve, reject) => {
    resolve(session.end().then(() => {
      t.step(() => {
        assert_throws_dom('InvalidStateError', () => session.updateRenderState({}));
      });
    }));
  });
};


let testBaseLayer = function(session, fakeDeviceController, t, sessionObjects) {
  return new Promise((resolve, reject) => {
    navigator.xr.test.simulateUserActivation(() => {
      navigator.xr.requestSession('inline').then((tempSession) => {
        t.step(() => {
          assert_not_equals(session, tempSession);
          assert_throws_dom('InvalidStateError', () => session.updateRenderState({ baseLayer : new XRWebGLLayer(tempSession, sessionObjects.gl), }));
        });
      });
      resolve();
    });
  });
};

let testFieldOfView = function(session, fakeDeviceController, t) {
  return new Promise((resolve, reject) => {
    t.step(() => {
      assert_throws_dom('InvalidStateError', () => session.updateRenderState({ inlineVerticalFieldOfView : Math.PI, }));
    });
    resolve();
  });
};

let testNoParams = function(session, fakeDeviceController, t) {
  return new Promise((resolve, reject) => {
    try {
      session.updateRenderState({});
    } catch (err) {
      assert_unreached("updateRenderState should not fail (actually not do anything) with no params");
    }
    resolve();
  });
};

let testParams = function(session, fakeDeviceController, t, sessionObjects) {
  return new Promise((resolve, reject) => {
    let gl = sessionObjects.gl;
    try {
      gl.makeXRCompatible().then(() => {
        t.step(() => {
          let fov = Math.PI;
          let near = 0.2;
          let far = 0.8;
          let layer = new XRWebGLLayer(session, gl);
          session.updateRenderState({ inlineVerticalFieldOfView: fov, depthNear: near, depthFar: far, baseLayer: layer });
          // The update can only happen between frame boundaries, updateRenderState only queues changes.
          assert_not_equals(session.renderState.inlineVerticalFieldOfView, fov);
          assert_not_equals(session.renderState.depthNear, near);
          assert_not_equals(session.renderState.depthFar, far);
          assert_not_equals(session.renderState.baseLayer, layer);
        });
      });
    } catch (err) {
      assert_unreached("updateRenderState should not fail when all params are specified");
    }
    resolve();
  });
};

let testMinMaxClippingPlanes = function(session, fakeDeviceController, t, sessionObjects) {
  return new Promise((resolve, reject) => {
    let gl = sessionObjects.gl;
    gl.makeXRCompatible().then(() => {
      t.step(() => {
        let near = 0.2;
        let far = 0.8;
        let layer = new XRWebGLLayer(session, gl);
        session.updateRenderState({ depthNear: near, depthFar: far, baseLayer: layer });
        assert_not_equals(session.renderState.depthNear, near);
        assert_not_equals(session.renderState.depthFar, far);
        assert_not_equals(session.renderState.baseLayer, layer);
        session.requestAnimationFrame((time, xrFrame) => {
          t.step(() => {
            assert_equals(session.renderState.depthNear, near);
            assert_equals(session.renderState.depthFar, far);
            // Clamp negative values
            near = -20.3;
            far = -1.5;
            session.updateRenderState({ depthNear: near, depthFar: far });
            session.requestAnimationFrame((time, xrFrame) => {
              t.step(() => {
                assert_equals(session.renderState.depthNear, 0.0);
                assert_equals(session.renderState.depthFar, 0.0);
                resolve();
              });
            });
          });
        });
      });
    });
  });
};

let testName = "updateRenderState handles appropriately ended sessions";
xr_session_promise_test(testName, testSessionEnded, fakeDeviceInitParams, 'immersive-vr');

testName = "updateRenderState handles appropriately baseLayers created with different sessions";
xr_session_promise_test(testName, testBaseLayer, fakeDeviceInitParams, 'immersive-vr');

testName = "updateRenderState handles appropriately immersive sessions with specified inlineVerticalFieldOfView";
xr_session_promise_test(testName, testFieldOfView, fakeDeviceInitParams, 'immersive-vr');

testName = "updateRenderState handles appropriately XRRenderStateInit with no params";
xr_session_promise_test(testName, testNoParams, fakeDeviceInitParams, 'immersive-vr');

testName = "updateRenderState handles appropriately XRRenderStateInit params";
xr_session_promise_test(testName, testParams, fakeDeviceInitParams, 'inline');

testName = "updateRenderState clamps appropriately near/far clipping planes";
xr_session_promise_test(testName, testMinMaxClippingPlanes, fakeDeviceInitParams, 'immersive-vr');

</script>
